Samsung QLED has nothing to do with mini-or microleds. It´s just marketing term and it`s sounds allmost OLED so it`s ment to confuse customers. Most of the QLEDs tv`s are normal edge led and higher ends are full array led-backlight. But the led`s are normal, typical size and thats why FALD-models have low number of zones what can be invidually adjusted. Minileds are much smaller in size and you can have much greater number of zones and in theory, it works allmost like OLED without it disadvantages. But still every pixel don`t have own separate light source and they are grouped in zones. Microled is smaller in size and then you can have ”self emiting” pixels depending on screen resolution.